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getsid (2)
GETSID(2) Linux Programmer's Manual GETSID(2)
NAME
getsid - get session ID
SYNOPSIS
#include <unistd.h>
pid_t getsid(pid_t pid);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
getsid(): _XOPEN_SOURCE >= 500
DESCRIPTION
getsid(0) returns the session ID of the calling process. getsid(p)
returns the session ID of the process with process ID p. (The session
ID of a process is the process group ID of the session leader.)
RETURN VALUE
On success, a session ID is returned. On error, (pid_t) -1 will be
returned, and errno is set appropriately.
ERRORS
EPERM A process with process ID p exists, but it is not in the same
session as the current process, and the implementation considers
this an error.
ESRCH No process with process ID p was found.
CONFORMING TO
SVr4, POSIX.1-2001.
NOTES
Linux does not return EPERM.
Linux has this system call since Linux 1.3.44. There is libc support
since libc 5.2.19.
SEE ALSO
getpgid(2), setsid(2), credentials(7)
Linux 2007-07-26 GETSID(2)
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